SUSE Linux Enterprise 15 カーネルが更新され、さまざまなセキュリティおよびバグの修正が行われています。以下のセキュリティバグが修正されました。

  - CVE-2018-3620：ベアメタルシステムのローカル攻撃者が、ハイパースレッドプロセッサーでの投機的なコードパターンを使用して、同じCPUコアで他のハイパースレッドが使用するL1データキャッシュに存在するデータを読み取り、機密データを漏洩する可能性がありました（bnc#1087081）。

  - CVE-2018-3646：仮想化されたゲストシステムのローカル攻撃者が、ハイパースレッドプロセッサーでの投機的なコードパターンを使用して、同じCPUコアで他のハイパースレッドが使用するL1データキャッシュに存在するデータを読み取り、他の仮想マシンやホストシステムからでも、機密データを漏洩する可能性がありました。
    （bnc#1089343）。

  - CVE-2018-5391 別名「FragmentSmack」：リモート攻撃者がIPパケット再アセンブリの欠陥を利用して、大量のCPU時間を消費する可能性があります（bnc#1103097）。

  - CVE-2018-10876：ext4ファイルシステムコードに欠陥が見つかりました。細工されたext4イメージをマウントして操作するとき、ext4_ext_remove_space()関数でメモリ解放後使用（Use After Free）が発生する可能性があります。（bnc#1099811）

  - CVE-2018-10877：-ext4ファイルシステムは、細工されたext4ファイルシステムイメージを操作する場合にext4_ext_drop_refs()関数の領域外アクセスに対して脆弱です。
    (bnc#1099846)

  - CVE-2018-10878：ext4ファイルシステムに欠陥が見つかりました。
    細工されたext4ファイルシステムイメージをマウントして操作することにより、ローカルユーザーが、領域外書き込みを発生させ、サービス拒否を引き起こしたり、詳細不明なその他の影響を与えたりする可能性があります。（bnc#1099813）

  - CVE-2018-10879：ext4ファイルシステムに欠陥が見つかりました。
    ローカルユーザーがext4_xattr_set_entry関数でメモリ解放後使用（Use After Free）を引き起こす可能性があり、細工されたext4ファイルシステムイメージ内のファイル名を変更することでサービス拒否またはその他の詳細不明な影響が発生する可能性があります。（bnc#1099844）

  - CVE-2018-10880：Linuxカーネルは、ext4_update_inline_data()で細工されたext4イメージをマウントしてこのイメージに書き込むときに、ext4ファイルシステムコードのスタック領域外書き込みに対して脆弱です。攻撃者がこれを悪用して、システムクラッシュとサービス拒否を引き起こす可能性があります。
    （bnc#1099845）

  - CVE-2018-10881：ext4ファイルシステムに欠陥が見つかりました。
    細工されたext4ファイルシステムイメージをマウントして操作することにより、ローカルユーザーが、ext4_get_group_info関数に領域外アクセスを発生させ、サービス拒否およびシステムクラッシュを引き起こす可能性があります。（bnc#1099864）

  - CVE-2018-10882：ext4ファイルシステムに欠陥が見つかりました。
    細工されたext4ファイルシステムイメージをアンマウントすることにより、ローカルユーザーが、fs/jbd2/transaction.cコードで領域外書き込みを発生させ、サービス拒否およびシステムクラッシュを引き起こす可能性があります。（bnc#1099849）

  - CVE-2018-10883：ext4ファイルシステムに欠陥が見つかりました。
    ローカルユーザーが細工されたext4ファイルシステムイメージをマウントし操作することによって、jbd2_journal_dirty_metadata()の領域外書き込み、サービス拒否、システムクラッシュを引き起こす可能性があります。（bnc#1099863）

更新パッケージには、セキュリティ関連以外の修正も含まれています。詳細については、アドバイザリを参照してください。

注意：Tenable Network Securityは、前述の記述ブロックをSUSEセキュリティアドバイザリから直接抽出しています。Tenableでは、そこに新しい問題を追加することはせずに、できる限り自動的に整理と書式設定をするようにしています。

遠端 Ubuntu 18.04 LTS 主機上安裝的一個套件受到 USN-3871-3 公告中所提及的多個弱點影響。

  - 在 Linux 核心的 ext4 檔案系統程式碼中發現一個缺陷。在掛載及操作特製的 ext4 影像時，ext4_ext_remove_space() 函式中可能發生釋放後使用。(CVE-2018-10876)

  - Linux 核心 ext4 檔案系統在特製的 ext4 檔案系統影像上作業時，容易受到 ext4_ext_drop_refs() 函式中的超出邊界存取影響。(CVE-2018-10877)

  在 Linux 核心的 ext4 檔案系統中發現一個缺陷。本機使用者可藉由掛接及操作特製的 ext4 檔案系統影像，造成超出邊界寫入和拒絕服務，或可能造成其他不明影響。(CVE-2018-10878)

  在 Linux 核心的 ext4 檔案系統中發現一個缺陷。本機使用者可藉由在特製的 ext4 檔案系統影像中重新命名檔案，造成 ext4_xattr_set_entry 函式中發生釋放後使用，以及造成拒絕服務或不明的其他影響。(CVE-2018-10879)

  - 在 ext4_update_inline_data() 中掛載和寫入特製的 ext4 映像時，Linux 核心的 ext4 檔案系統程式碼中容易發生堆疊超出邊界寫入問題。攻擊者可利用此弱點造成系統當機和拒絕服務。(CVE-2018-10880)

  在 Linux 核心的 ext4 檔案系統中發現一個缺陷。本機使用者可藉由卸載特製的 ext4 檔案系統影像，造成 fs/jbd2/transaction.c 程式碼中發生超出邊界寫入、拒絕服務和系統當機。(CVE-2018-10882)

  在 Linux 核心的 ext4 檔案系統中發現一個缺陷。本機使用者可藉由掛接特製的 ext4 檔案系統影像並在該系統上操作，造成 jbd2_journal_dirty_metadata() 中發生超出邊界寫入、拒絕服務和系統當機。(CVE-2018-10883)

  - 在 Linux 核心中發現一個缺陷，攻擊者可以利用此缺陷，從虛擬機器客體中不受控制地讀取核心記憶體。connect() 和 close() 函式之間的爭用情形可能會讓使用 AF_VSOCK 通訊協定的攻擊者收集 4 位元組的洩漏資訊，或可能攔截或損毀指定傳到其他用戶端的 AF_VSOCK 訊息。(CVE-2018-14625)

  - 啟用 nested(=1) 虛擬化時，在 Linux 核心的 KVM hypervisor 處理已發佈中斷時發現一個釋放後使用問題。在 nested_get_vmcs12_pages() 中，若處理已發佈插斷位址時發生錯誤，該函式會取消對應「pi_desc_page」，而不重設「pi_desc」 描述元位址 (稍後用於 pi_test_and_clear_on())。來賓使用者/處理程序可利用此缺陷來損毀主機核心，進而導致拒絕服務，甚或取得存取系統的權限。4.14.91 和 4.19.13 之前的核心都容易受到此弱點影響。(CVE-2018-16882)

  - 據發現，在 4.18.11 及之前版本的 Linux 核心中，fs/proc/base.c 的 proc_pid_stack 函式存在一個問題。此函式無法確保僅有 root 能檢查任意工作的核心堆疊，本機攻擊者可藉以利用活動堆疊散布和洩漏核心工作堆疊內容。(CVE-2018-17972)

  - 自 Linux 核心 3.2 版起，mremap() syscall 在放置 pagetable 鎖之後會執行 TLB 排清。
    如 ftruncate() 之類的 syscall 若是從 mremap() 中間之工作的 pagetable 移除項目，可能會短暫留存過期的 TLB 項目，導致在將實體頁面釋放到頁面配置器並重複使用之後，可對其進行存取。下列核心版本已修復此問題：
    4.9.135、4.14.78、4.18.16、4.19。(CVE-2018-18281)

  - 在 4.19.2 之前的 Linux 核心中，arch/x86/kvm/x86.c 的 vcpu_scan_ioapic 函式允許本機使用者透過特製系統呼叫找出未初始化的 ioapic，引致拒絕服務 (NULL 指標解除參照和 BUG)。(CVE-2018-19407)

  - drivers/hid/hid-debug.c 的 hid_debug_events_read 中可能存在超出邊界寫入問題，這是缺少邊界檢查所致。這可能會導致需要系統執行權限的本機權限提升。不需使用者互動即可惡意利用。產品：Android 版本：Android 核心 Android ID：A-71361580。(CVE-2018-9516)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

現已提供適用於 Slackware 14.2 的新核心套件，可修正多個安全性問題。

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - 在 ext4_update_inline_data() 中掛載和寫入特製的 ext4 映像時，Linux 核心的 ext4 檔案系統程式碼中容易發生堆疊超出邊界寫入問題。攻擊者可利用此弱點造成系統當機和拒絕服務。(CVE-2018-10880)

請注意，Nessus 依賴供應商報告的套件存在。

Linux 4.9 針對 Debian 8 提供套件為 linux-4.9。這為目前使用 'jessie-backports’ 套件中的核心套件的系統提供了支援的升級路徑。無需升級使用 Linux 3.16 的系統，因為 LTS 期間仍將繼續支援該核心版本。此反向移植不包含以下二進位套件：hyperv-daemons libcpupower1 libcpupower-dev libusbip-dev linux-compiler-gcc-4.9-x86 linux-cpupower linux-libc-dev usbip。其中大多數舊版本是從 Debian 8 中的其他來源套件所建置.在 Linux 核心中發現數個弱點，這些弱點可能會導致權限提升、拒絕服務或資訊洩漏。CVE-2017-5753 容易受到 Spectre 變體 1 (邊界檢查繞過) 影響的其他程式碼案例已經緩解。CVE-2017-18255 據發現，效能事件子系統未正確驗證 kernel.perf_cpu_time_max_percent sysctl 的值。設定較大的值可能會產生不明的安全性影響。不過，只有有權的使用者可以設定此 sysctl。CVE-2018-1118 syzbot 軟體發現 vhost 驅動程式未初始化訊息緩衝區，之後使用者的處理程序可能會予以讀取。具有 /dev/vhost-net 裝置存取權的使用者可利用此弱點，從核心或其他使用者的處理程序讀取敏感資訊。CVE-2018-1120 Qualys 報告，能裝載 FUSE 檔案系統的使用者可建立一個處理程序，這樣，嘗試讀取其命令列的另一個處理程序將被封鎖任意的時間長度。這可以用於拒絕服務，或有助於利用其他程式中的爭用情形。CVE-2018-1130 syzbot 軟體發現 sendmsg() 的 DCCP 實作未檢查通訊端狀態，可能導致 NULL 指標解除參照。本機使用者可利用此缺陷造成拒絕服務 (當機)。CVE-2018-3639 眾多研究人員發現，在許多處理器中實作的推測儲存繞過 (SSB) 功能可用於從其他內容讀取敏感資訊。特別是，軟體沙箱中的程式碼可能可以讀取沙箱外部的敏感資訊。此問題也稱為 Spectre 變體 4。透過停用 SSB，此更新緩解了某些 x86 處理器上的問題。這需要更新處理器的微碼，且需要費用。它可能包含在系統 BIOS 或 UEFI 韌體的更新中，或在 intel-microcode 或 amd64-microcode 套件的未來更新中。停用 SSB 會大幅降低效能，因此預設僅能在使用 seccomp 功能的工作中進行。需要這種緩解措施的應用程式應該透過 prctl() 系統呼叫來明確要求。使用者可使用 spec_store_bypass_disable 核心參數來控制啟用緩解措施的位置。CVE-2018-5814 Jakub Jirasek 報告 USB/IP 主機驅動程式中的爭用情形。惡意用戶端可利用此弱點在 USB/IP 伺服器上導致拒絕服務 (當機或記憶體損毀)，並可能執行程式碼。CVE-2018-10021 拔除 SAS 纜線的實際存在攻擊者可導致拒絕服務 (記憶體洩漏和 WARN)。CVE-2018-10087、CVE-2018-10124 zhongjiang 發現 wait4() 和 kill() 系統呼叫實作未檢查 INT_MIN 是否有無效的 pid 值。如果使用者傳遞此值，則程式碼的行為未正式定義，並且可能會對安全性產生影響。CVE-2018-10853 Andy Lutomirski 和 Mika Penttilä 報告，x86 處理器的 KVM 在模擬某些指令時未執行必要的權限檢查。來賓虛擬機器中的無權限使用者可利用此弱點提升其在來賓內的權限。CVE-2018-10876、CVE-2018-10877、CVE-2018-10878、CVE-2018-10879、CVE-2018-10880、CVE-2018-10881、CVE-2018-10882、CVE-2018-10883 SSLab、Gatech 的 Wen Xu 報告特製的 ext4 檔案系統映像可觸發當機或記憶體損毀。能夠裝載任意檔案系統的本機使用者，或提供要裝載檔案系統的攻擊者，可以利用此弱點導致拒絕服務或可能的權限提升。CVE-2018-10940 Dan Carpenter 報告光碟機 (cdrom) 未正確驗證 CDROM_MEDIA_CHANGED ioctl 的參數。具有 cdrom 裝置存取權的使用者可利用此弱點造成拒絕服務 (當機)。CVE-2018-11506 Piotr Gabriel Kosinski 和 Daniel Shapira 報告 SCSI 光碟機 (sr) 未針對感應資料配置足夠的大型緩衝區。具有 SCSI 光碟機裝置存取權且會產生 64 位元組以上感應資料的使用者，可利用此弱點導致拒絕服務 (當機或記憶體損毀)，並可能導致權限提升。CVE-2018-12233 Shankara Pailoor 報告特製的 JFS 檔案系統映像可觸發拒絕服務 (記憶體損毀)。此弱點也可會被利用來提升權限。CVE-2018-1000204 syzbot 軟體發現 SCSI 通用驅動程式 (sg) 在某些情況下將允許從未初始化的緩衝區讀取資料，這些緩衝區可能包含來自核心或其他工作的敏感資訊。但是，只有具有 CAP_SYS_ADMIN 或 CAP_SYS_RAWIO 功能的有權使用者才能執行此操作，因此對安全性影響微乎其微。針對 Debian 8「Jessie」，這些問題已在 4.9.110-1~deb8u1 版本中修正。此更新還修正 Debian 錯誤 #860900、#872907、#892057、#896775、#897590 和 #898137；並包括來自穩定更新 4.9.89-4.9.110 (含) 的許多錯誤修正。建議您升級 linux-4.9 套件。注意：Tenable Network Security 已直接從 DLA 安全性公告擷取前置描述區塊。Tenable 已盡量在不造成其他問題的前提下，嘗試自動清理並將其格式化。

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3871-3 advisory.

    Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the     Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could     cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10876,     CVE-2018-10879)

    Wen Xu discovered that a buffer overflow existed in the ext4 filesystem implementation in the Linux     kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10877)

    Wen Xu discovered that an out-of-bounds write vulnerability existed in the ext4 filesystem implementation     in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted,     could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10878,     CVE-2018-10882)

    Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly ensure that     xattr information remained in inode bodies. An attacker could use this to construct a malicious ext4 image     that, when mounted, could cause a denial of service (system crash). (CVE-2018-10880)

    Wen Xu discovered that the ext4 file system implementation in the Linux kernel could possibly perform an     out of bounds write when updating the journal for an inline file. An attacker could use this to construct     a malicious ext4 image that, when mounted, could cause a denial of service (system crash).
    (CVE-2018-10883)

    It was discovered that a race condition existed in the vsock address family implementation of the Linux     kernel that could lead to a use-after-free condition. A local attacker in a guest virtual machine could     use this to expose sensitive information (host machine kernel memory). (CVE-2018-14625)

    Cfir Cohen discovered that a use-after-free vulnerability existed in the KVM implementation of the Linux     kernel, when handling interrupts in environments where nested virtualization is in use (nested KVM     virtualization is not enabled by default in Ubuntu kernels). A local attacker in a guest VM could possibly     use this to gain administrative privileges in a host machine. (CVE-2018-16882)

    Jann Horn discovered that the procfs file system implementation in the Linux kernel did not properly     restrict the ability to inspect the kernel stack of an arbitrary task. A local attacker could use this to     expose sensitive information. (CVE-2018-17972)

    Jann Horn discovered that the mremap() system call in the Linux kernel did not properly flush the TLB when     completing, potentially leaving access to a physical page after it has been released to the page     allocator. A local attacker could use this to cause a denial of service (system crash), expose sensitive     information, or possibly execute arbitrary code. (CVE-2018-18281)

    Wei Wu discovered that the KVM implementation in the Linux kernel did not properly ensure that ioapics     were initialized. A local attacker could use this to cause a denial of service (system crash).
    (CVE-2018-19407)

    It was discovered that the debug interface for the Linux kernel's HID subsystem did not properly perform     bounds checking in some situations. An attacker with access to debugfs could use this to cause a denial of     service or possibly gain additional privileges. (CVE-2018-9516)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A flaw was found in the Linux kernel's ext4 filesystem.
    A local user can cause an out-of-bounds write and a     denial of service or unspecified other impact is     possible by mounting and operating a crafted ext4     filesystem image.(CVE-2018-10878)

  - An issue was discovered in can_can_gw_rcv in     net/can/gw.c in the Linux kernel through 4.19.13. The     CAN frame modification rules allow bitwise logical     operations that can be also applied to the can_dlc     field. Because of a missing check, the CAN drivers may     write arbitrary content beyond the data registers in     the CAN controller's I/O memory when processing can-gw     manipulated outgoing frames. This is related to     cgw_csum_xor_rel. An unprivileged user can trigger a     system crash (general protection fault).(CVE-2019-3701)

  - A flaw was found in the Linux kernel's ext4 filesystem.
    A local user can cause an out-of-bound access in     ext4_get_group_info function, a denial of service, and     a system crash by mounting and operating on a crafted     ext4 filesystem image.(CVE-2018-10881)

  - A flaw was found in the Linux kernel's ext4 filesystem     code. A stack-out-of-bounds write in     ext4_update_inline_data() is possible when mounting and     writing to a crafted ext4 image. An attacker could use     this to cause a system crash and a denial of     service.(CVE-2018-10880)

  - The crypto API in the Linux kernel through 3.9-rc8 does     not initialize certain length variables, which allows     local users to obtain sensitive information from kernel     stack memory via a crafted recvmsg or recvfrom system     call, related to the hash_recvmsg function in     crypto/algif_hash.c and the skcipher_recvmsg function     in crypto/algif_skcipher.c.(CVE-2013-3076)

  - weakness was found in the Linux kernel's implementation     of random seed data. Programs, early in the boot     sequence, could use the data allocated for the seed     before it was sufficiently generated.(CVE-2018-1108)

  - An issue was discovered in the proc_pid_stack function     in fs/proc/base.c in the Linux kernel. An attacker with     a local account can trick the stack unwinder code to     leak stack contents to userspace. The fix allows only     root to inspect the kernel stack of an arbitrary     task.(CVE-2018-17972)

  - A security flaw was found in the     chap_server_compute_md5() function in the ISCSI target     code in the Linux kernel in a way an authentication     request from an ISCSI initiator is processed. An     unauthenticated remote attacker can cause a stack     buffer overflow and smash up to 17 bytes of the stack.
    The attack requires the iSCSI target to be enabled on     the victim host. Depending on how the target's code was     built (i.e. depending on a compiler, compile flags and     hardware architecture) an attack may lead to a system     crash and thus to a denial of service or possibly to a     non-authorized access to data exported by an iSCSI     target. Due to the nature of the flaw, privilege     escalation cannot be fully ruled out, although we     believe it is highly unlikely.(CVE-2018-14633)

  - An issue was discovered in the Linux kernel before     4.18.6. An information leak in cdrom_ioctl_drive_status     in drivers/cdrom/cdrom.c could be used by local     attackers to read kernel memory because a cast from     unsigned long to int interferes with bounds     checking.(CVE-2018-16658)

  - In the Linux kernel before 4.17, a local attacker able     to set attributes on an xfs filesystem could make this     filesystem non-operational until the next mount by     triggering an unchecked error condition during an xfs     attribute change, because xfs_attr_shortform_addname in     fs/xfs/libxfs/xfs_attr.c mishandles ATTR_REPLACE     operations with conversion of an attr from short to     long form.(CVE-2018-18690)

  - A security flaw was found in the Linux kernel in     drivers/tty/n_tty.c which allows local attackers (ones     who are able to access pseudo terminals) to lock them     up and block further usage of any pseudo terminal     devices due to an EXTPROC versus ICANON confusion in     TIOCINQ handler.(CVE-2018-18386)

  - The Linux kernel was found to be vulnerable to a NULL     pointer dereference bug in the __netlink_ns_capable()     function in the net/netlink/af_netlink.c file. A local     attacker could exploit this when a net namespace with a     netnsid is assigned to cause a kernel panic and a     denial of service.(CVE-2018-14646)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

New kernel packages are available for Slackware 14.2 to fix security issues.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Linux kernel is vulnerable to a stack-out-of-bounds write in the ext4 filesystem code when mounting and     writing to a crafted ext4 image in ext4_update_inline_data(). An attacker could use this to cause a system     crash and a denial of service. (CVE-2018-10880)

Note that Nessus relies on the presence of the package as reported by the vendor.

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The kernel package contains the Linux kernel (vmlinuz),     the core of any Linux operating system. The kernel     handles the basic functions of the operating system:
    memory allocation, process allocation, device input and     output, etc.Security Fix(es):A flaw was found in Linux     kernel in the ext4 filesystem code. A use-after-free is     possible in ext4_ext_remove_space() function when     mounting and operating a crafted ext4     image.(CVE-2018-10876)A flaw was found in the Linux     kernel. A use-after-free was found in the way the     console subsystem was using ioctls KDGKBSENT and     KDSKBSENT. A local user could use this flaw to get read     memory access out of bounds. The highest threat from     this vulnerability is to data     confidentiality.(CVE-2020-25656)A flaw was found in the     way RTAS handled memory accesses in userspace to kernel     communication. On a locked down (usually due to Secure     Boot) guest system running on top of PowerVM or KVM     hypervisors (pseries platform) a root like local user     could use this flaw to further increase their     privileges to that of a running     kernel.(CVE-2020-27777)A information disclosure     vulnerability in the Upstream kernel encrypted-keys.
    Product: Android. Versions: Android kernel. Android ID:
    A-70526974.(CVE-2017-13305)A race condition was found     in the Linux kernels implementation of the floppy disk     drive controller driver software. The impact of this     issue is lessened by the fact that the default     permissions on the floppy device (/dev/fd0) are     restricted to root. If the permissions on the device     have changed the impact changes greatly. In the default     configuration root (or equivalent) permissions are     required to attack this flaw.(CVE-2021-20261)An issue     was discovered in dlpar_parse_cc_property in     arch/powerpc/platforms/pseries/dlpar.c in the Linux     kernel through 5.1.6. There is an unchecked kstrdup of     prop->name, which might allow an attacker to cause a     denial of service (NULL pointer dereference and system     crash).(CVE-2019-12614)An issue was discovered in     fs/xfs/xfs_icache.c in the Linux kernel through 4.17.3.
    There is a NULL pointer dereference and panic in     lookup_slow() on a NULL inode->i_ops pointer when doing     pathwalks on a corrupted xfs image. This occurs because     of a lack of proper validation that cached inodes are     free during allocation.(CVE-2018-13093)An issue was     discovered in rds_tcp_kill_sock in net/rds/tcp.c in the     Linux kernel before 5.0.8. There is a race condition     leading to a use-after-free, related to net namespace     cleanup.(CVE-2019-11815)An issue was discovered in the     Linux kernel through 5.11.3. A kernel pointer leak can     be used to determine the address of the iscsi_transport     structure. When an iSCSI transport is registered with     the iSCSI subsystem, the transport's handle is     available to unprivileged users via the sysfs file     system, at     /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When     read, the show_transport_handle function (in     drivers/scsi/scsi_transport_iscsi.c) is called, which     leaks the handle. This handle is actually the pointer     to an iscsi_transport struct in the kernel module's     global variables.(CVE-2021-27363)An issue was     discovered in the Linux kernel through 5.11.3. Certain     iSCSI data structures do not have appropriate length     constraints or checks, and can exceed the PAGE_SIZE     value. An unprivileged user can send a Netlink message     that is associated with iSCSI, and has a length up to     the maximum length of a Netlink     message.(CVE-2021-27365)An issue was discovered in the     Linux kernel through 5.11.3.
    drivers/scsi/scsi_transport_iscsi.c is adversely     affected by the ability of an unprivileged user to     craft Netlink messages.(CVE-2021-27364)An issue was     discovered in yurex_read in drivers/usb/misc/yurex.c in     the Linux kernel before 4.17.7. Local attackers could     use user access read/writes with incorrect bounds     checking in the yurex USB driver to crash the kernel or     potentially escalate     privileges.(CVE-2018-16276)drivers/infiniband/core/ucma     .c in the Linux kernel through 4.17.11 allows     ucma_leave_multicast to access a certain data structure     after a cleanup step in ucma_process_join, which allows     attackers to cause a denial of service     (use-after-free).(CVE-2018-14734)In create_pinctrl of     core.c, there is a possible out of bounds read due to a     use after free. This could lead to local information     disclosure with no additional execution privileges     needed. User interaction is not needed for     exploitation.Product: AndroidVersions: Android     kernelAndroid ID: A-140550171(CVE-2020-0427)In     do_epoll_ctl and ep_loop_check_proc of eventpoll.c,     there is a possible use after free due to a logic     error. This could lead to local escalation of privilege     with no additional execution privileges needed. User     interaction is not needed for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-147802478References: Upstream kernel(CVE-2020-0466)In     fs/ocfs2/cluster/ nodemanager.c in the Linux kernel     before 4.15, local users can cause a denial of service     (NULL pointer dereference and BUG) because a required     mutex is not used.(CVE-2017-18216)In the Linux kernel     before 5.2, a setxattr operation, after a mount of a     crafted ext4 image, can cause a slab-out-of-bounds     write access because of an ext4_xattr_set_entry     use-after-free in fs/ext4/xattr.c when a large old_size     value is used in a memset call, aka     CID-345c0dbf3a30.(CVE-2019-19319)In the Linux kernel     before version 4.12, Kerberos 5 tickets decoded when     using the RXRPC keys incorrectly assumes the size of a     field. This could lead to the size-remaining variable     wrapping and the data pointer going over the end of the     buffer. This could possibly lead to memory corruption     and possible privilege escalation.(CVE-2017-7482)In     uvc_scan_chain_forward of uvc_driver.c, there is a     possible linked list corruption due to an unusual root     cause. This could lead to local escalation of privilege     in the kernel with no additional execution privileges     needed. User interaction is not needed for     exploitation.Product: AndroidVersions: Android     kernelAndroid ID: A-111893654References: Upstream     kernel(CVE-2020-0404)In various methods of     hid-multitouch.c, there is a possible out of bounds     write due to a missing bounds check. This could lead to     local escalation of privilege with no additional     execution privileges needed. User interaction is not     needed for exploitation.Product: AndroidVersions:
    Android kernelAndroid ID: A-162844689References:
    Upstream kernel(CVE-2020-0465)It was found that the raw     midi kernel driver does not protect against concurrent     access which leads to a double realloc (double free) in     snd_rawmidi_input_params() and     snd_rawmidi_output_status() which are part of     snd_rawmidi_ioctl() handler in rawmidi.c file. A     malicious local attacker could possibly use this for     privilege escalation.(CVE-2018-10902)Linux kernel ext4     filesystem is vulnerable to an out-of-bound access in     the ext4_ext_drop_refs() function when operating on a     crafted ext4 filesystem image.(CVE-2018-10877)Linux     kernel is vulnerable to a stack-out-of-bounds write in     the ext4 filesystem code when mounting and writing to a     crafted ext4 image in ext4_update_inline_data(). An     attacker could use this to cause a system crash and a     denial of service.(CVE-2018-10880)Linux Kernel contains     an out-of-bounds read flaw in the asn1_ber_decoder()     function in lib/asn1_decoder.c that is triggered when     decoding ASN.1 data. This may allow a remote attacker     to disclose potentially sensitive memory     contents.(CVE-2018-9383)use-after-free read in     sunkbd_reinit in     drivers/input/keyboard/sunkbd.c(CVE-2020-25669)mwifiex_     cmd_802_11_ad_hoc_start in drivers/     net/wireless/marvell/mwifiex/join.c in the Linux kernel     through 5.10.4 might allow remote attackers to execute     arbitrary code via a long SSID value, aka     CID-5c455c5ab332.(CVE-2020-36158)fs/ nfsd/ nfs3xdr.c in     the Linux kernel through 5.10.8, when there is an NFS     export of a subdirectory of a filesystem, allows remote     attackers to traverse to other parts of the filesystem     via READDIRPLUS. NOTE: some parties argue that such a     subdirectory export is not intended to prevent this     attack see also the exports(5) no_subtree_check default     behavior.(CVE-2021-3178)In the Linux kernel before     4.20.8, kvm_ioctl_create_device in virt/kvm/kvm_main.c     mishandles reference counting because of a race     condition, leading to a     use-after-free.(CVE-2019-6974)The KVM implementation in     the Linux kernel through 4.20.5 has a     Use-after-Free.(CVE-2019-7221)A flaw was found in the     JFS filesystem code. This flaw allows a local attacker     with the ability to set extended attributes to panic     the system, causing memory corruption or escalating     privileges. The highest threat from this vulnerability     is to confidentiality, integrity, as well as system     availability.(CVE-2020-27815)An out-of-bounds (OOB)     memory access flaw was found in x25_bind in     net/x25/af_x25.c in the Linux kernel. A bounds check     failure allows a local attacker with a user account on     the system to gain access to out-of-bounds memory,     leading to a system crash or a leak of internal kernel     information. The highest threat from this vulnerability     is to confidentiality, integrity, as well as system     availability.(CVE-2020-35519)In     drivers/pci/hotplug/rpadlpar_sysfs.c in the Linux     kernel through 5.11.8, the RPA PCI Hotplug driver has a     user-tolerable buffer overflow when writing a new     device name to the driver from userspace, allowing     userspace to write data to the kernel stack frame     directly. This occurs because add_slot_store and     remove_slot_store mishandle drc_name '\0' termination,     aka CID-cc7a0bb058b8.(CVE-2021-28972)A NULL pointer     dereference was found in the net/rds/rdma.c
    __rds_rdma_map() function in the Linux kernel before     4.14.7 allowing local attackers to cause a system panic     and a denial-of-service, related to RDS_GET_MR and     RDS_GET_MR_FOR_DEST.(CVE-2018-7492)The Siemens R3964     line discipline driver in drivers/tty/ n_r3964.c in the     Linux kernel before 5.0.8 has multiple race     conditions.(CVE-2019-11486)The kernel in Android before     2016-08-05 on Nexus 7 (2013) devices allows attackers     to gain privileges via a crafted application, aka     internal bug 28522518.(CVE-2016-3857)The KVM     implementation in the Linux kernel through 4.14.7     allows attackers to obtain potentially sensitive     information from kernel memory, aka a write_mmio     stack-based out-of-bounds read, related to     arch/x86/kvm/x86.c and     include/trace/events/kvm.h.(CVE-2017-17741)The     sctp_process_param function in net/sctp/sm_make_chunk.c     in the SCTP implementation in the Linux kernel before     3.17.4, when ASCONF is used, allows remote attackers to     cause a denial of service (NULL pointer dereference and     system crash) via a malformed INIT     chunk.(CVE-2014-7841)The XFS subsystem in the Linux     kernel through 4.8.2 allows local users to cause a     denial of service (fdatasync failure and system hang)     by using the vfs syscall group in the trinity program,     related to a 'page lock order bug in the XFS seek     hole/data implementation.'(CVE-2016-8660)The     xfs_dinode_verify function in     fs/xfs/libxfs/xfs_inode_buf.c in the Linux kernel     through 4.16.3 allows local users to cause a denial of     service (xfs_ilock_attr_map_shared invalid pointer     dereference) via a crafted xfs image.(CVE-2018-10322)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Linux 4.9 has been packaged for Debian 8 as linux-4.9. This provides a supported upgrade path for systems that currently use kernel packages from the 'jessie-backports' suite.

There is no need to upgrade systems using Linux 3.16, as that kernel version will also continue to be supported in the LTS period.

This backport does not include the following binary packages :

hyperv-daemons libcpupower1 libcpupower-dev libusbip-dev linux-compiler-gcc-4.9-x86 linux-cpupower linux-libc-dev usbip

Older versions of most of those are built from other source packages in Debian 8.

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

CVE-2017-5753

Further instances of code that was vulnerable to Spectre variant 1 (bounds-check bypass) have been mitigated.

CVE-2017-18255

It was discovered that the performance events subsystem did not properly validate the value of the kernel.perf_cpu_time_max_percent sysctl. Setting a large value could have an unspecified security impact. However, only a privileged user can set this sysctl.

CVE-2018-1118

The syzbot software found that the vhost driver did not initialise message buffers which would later be read by user processes. A user with access to the /dev/vhost-net device could use this to read sensitive information from the kernel or other users' processes.

CVE-2018-1120

Qualys reported that a user able to mount FUSE filesystems can create a process such that when another process attempting to read its command line will be blocked for an arbitrarily long time. This could be used for denial of service, or to aid in exploiting a race condition in the other program.

CVE-2018-1130

The syzbot software found that the DCCP implementation of sendmsg() does not check the socket state, potentially leading to a NULL pointer dereference. A local user could use this to cause a denial of service (crash). 

CVE-2018-3639

Multiple researchers have discovered that Speculative Store Bypass (SSB), a feature implemented in many processors, could be used to read sensitive information from another context. In particular, code in a software sandbox may be able to read sensitive information from outside the sandbox. This issue is also known as Spectre variant 4.

This update allows the issue to be mitigated on some x86 processors by disabling SSB. This requires an update to the processor's microcode, which is non-free. It may be included in an update to the system BIOS or UEFI firmware, or in a future update to the intel-microcode or amd64-microcode packages.

Disabling SSB can reduce performance significantly, so by default it is only done in tasks that use the seccomp feature. Applications that require this mitigation should request it explicitly through the prctl() system call. Users can control where the mitigation is enabled with the spec_store_bypass_disable kernel parameter.

CVE-2018-5814

Jakub Jirasek reported race conditions in the USB/IP host driver. A malicious client could use this to cause a denial of service (crash or memory corruption), and possibly to execute code, on a USB/IP server.

CVE-2018-10021

A physically present attacker who unplugs a SAS cable can cause a denial of service (memory leak and WARN).

CVE-2018-10087, CVE-2018-10124

zhongjiang found that the wait4() and kill() system call implementations did not check for the invalid pid value of INT_MIN. If a user passed this value, the behaviour of the code was formally undefined and might have had a security impact.

CVE-2018-10853

Andy Lutomirski and Mika Penttil&auml; reported that KVM for x86 processors did not perform a necessary privilege check when emulating certain instructions. This could be used by an unprivileged user in a guest VM to escalate their privileges within the guest.

CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879, CVE-2018-10880, CVE-2018-10881, CVE-2018-10882, CVE-2018-10883

Wen Xu at SSLab, Gatech, reported that crafted ext4 filesystem images could trigger a crash or memory corruption. A local user able to mount arbitrary filesystems, or an attacker providing filesystems to be mounted, could use this for denial of service or possibly for privilege escalation.

CVE-2018-10940

Dan Carpenter reported that the optical disc driver (cdrom) does not correctly validate the parameter to the CDROM_MEDIA_CHANGED ioctl. A user with access to a cdrom device could use this to cause a denial of service (crash).

CVE-2018-11506

Piotr Gabriel Kosinski and Daniel Shapira reported that the SCSI optical disc driver (sr) did not allocate a sufficiently large buffer for sense data. A user with access to a SCSI optical disc device that can produce more than 64 bytes of sense data could use this to cause a denial of service (crash or memory corruption), and possibly for privilege escalation.

CVE-2018-12233

Shankara Pailoor reported that a crafted JFS filesystem image could trigger a denial of service (memory corruption). This could possibly also be used for privilege escalation.

CVE-2018-1000204

The syzbot software found that the SCSI generic driver (sg) would in some circumstances allow reading data from uninitialised buffers, which could include sensitive information from the kernel or other tasks. However, only privileged users with the CAP_SYS_ADMIN or CAP_SYS_RAWIO capability were allowed to do this, so this has little or no security impact.

For Debian 8 'Jessie', these problems have been fixed in version 4.9.110-1~deb8u1. This update additionally fixes Debian bugs #860900, #872907, #892057, #896775, #897590, and #898137; and includes many more bug fixes from stable updates 4.9.89-4.9.110 inclusive.

We recommend that you upgrade your linux-4.9 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
120082	SUSE SLED15 / SLES15セキュリティ更新プログラム：カーネル（SUSE-SU-2018:2380-1）（Foreshadow）	Nessus	SuSE Local Security Checks	2019/1/2	2024/7/10	high
121593	Ubuntu 18.04 LTS：Linux 核心 (AWS、GCP、KVM、OEM、Raspberry Pi 2) 弱點 (USN-3871-3)	Nessus	Ubuntu Local Security Checks	2019/2/5	2024/8/27	high
121505	Slackware 14.2：Slackware 14.2 核心 (SSA:2019-030-01)	Nessus	Slackware Local Security Checks	2019/1/31	2024/6/25	high
246204	Linux Distros 未修補的弱點：CVE-2018-10880	Nessus	Misc.	2025/8/8	2025/9/30	medium
111165	Debian DLA-1423-1：linux-4.9 新套件 (Spectre)	Nessus	Debian Local Security Checks	2018/7/20	2024/9/4	high
121593	Ubuntu 18.04 LTS : Linux kernel (AWS, GCP, KVM, OEM, Raspberry Pi 2) vulnerabilities (USN-3871-3)	Nessus	Ubuntu Local Security Checks	2019/2/5	2024/8/27	high
122201	EulerOS 2.0 SP5 : kernel (EulerOS-SA-2019-1028)	Nessus	Huawei Local Security Checks	2019/2/15	2022/5/23	high
121505	Slackware 14.2 : Slackware 14.2 kernel (SSA:2019-030-01)	Nessus	Slackware Local Security Checks	2019/1/31	2024/6/25	high
246204	Linux Distros Unpatched Vulnerability : CVE-2018-10880	Nessus	Misc.	2025/8/8	2025/9/30	medium
149098	EulerOS 2.0 SP3 : kernel (EulerOS-SA-2021-1808)	Nessus	Huawei Local Security Checks	2021/4/30	2024/1/3	high
123269	openSUSE Security Update : the Linux Kernel (openSUSE-2019-618) (Foreshadow)	Nessus	SuSE Local Security Checks	2019/3/27	2024/6/11	high
111165	Debian DLA-1423-1 : linux-4.9 new package (Spectre)	Nessus	Debian Local Security Checks	2018/7/20	2024/9/4	high

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